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E. A. OOLES. MACHINE FOR CUTTING-SHEET METAL INTO OVAL- FORMS. No. 301,566. Pat ted July 8, 1884.

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.NITED STATES ATENiT which,

ERSKINE A. OOLES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- FOURTH TO FREDERICK V. TROEMNER, OF SAME PLACE.

MACHINE FOR CUTTING SHE ET METAL INTO OVAL FORMS.

SPECIFICATION forming part of Letters Patent No. 301,566, dated July 8, 1884.

Application filed July 27, 1883.

To aZZ whom it may concern.-

Be it known that I, ERSKINE A. COLES, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Im provementin Machines for Cutting Sheet Metal, 850., in Oval and other Forms, which improvement is fully set forth in the following specification and accompanying drawings, in which Figure 1 is stop or plan view, partly broken away, of the machine for cutting sheet metal embodying my invention. Fig. 2 isa side elevation thereof. Fig. 3 is a vertical section in linewa", Fig. 1.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of a machine for outi ting sheet-metal, &e.-,into oval and other forms,

whereby the work is accomplished in a true, uniform, and expeditious manner.

Referring to the drawings, A represents a table, which is properly supported, and on which is mounted a two-part shaft, B, the inner ends whereof carry heads 0, between which the sheet of metal ,to be cut is clamped. One part of the shaft B rotates in fixed bearings, and has connected with it a eranli haudle for operating purposes, and the other part is, adapted to slide and rotate in its bearings, and has in contact with it a spring, D, and lever D, which operate in reverse order for opening and closing the heads G for the application and removal of the sheet, said lever being attached to a treadle, D".

Fitted to the table A is a horizontally-arranged carriage, E, and secured to the shaftB is'a former or shaping-piece, F, which bears against a roller, G, on said carriage E, the

contour of the piece F coinciding with that which it is desired to impart to the sheet. To the table is pivoted aweighted lever, E,which is connected with the carriage E, the object whereof is to hold the roller G constantly in cont-act with the former or shaping-piece F.

. To the carriage E, at the end adjacent to the shaft B, is pivoted ayoke, H, to whose lower end are secured the cutters J of the machine, I

(No model.)

which are so disposed that when the sheet is clamped to the heads 0 they occupy positions 0 on opposite sides of said sheet.

Connected with the yoke H is an arm, K, to which is pivoted aweighted lever, L,the bearings whereof are on the table A, said lever carrying a stud or roller, L, which rests against 5 5 a cam, M, the latter being secured to the shaft B, and imparting its motion to the yoke 11, said weighted lever L being held constantly engaged with the cam M.

The operation is asfollows: The head onthe 6o sliding part of the shaft 13 is held separated from the other head by the action of the spring D, and the sheet or plate of metal to be cut is placed between the two heads and rested on the gage andsupport N, which latter is secured to the table Abelow said heads. The treadle Df is then depressechwhereby theheads firmly clamp the metal between them. The crank handle 011 the shaft 13 is now rotated, whereby the metal is carried around with the shaft, and, owing to the former or shaping-piece F, the carriage E is moved in accordance with the contour of said former or shaper. As said former is in the present case of oval shape,the cutters J, which are connected with the car- 7 5 riage E, are moved nearer to and farther from the center of said cutter, due to the oval eontour of the former, and thus the rotary cutters or shears are presented to and act upon the rotating piece of metal in such manner that it is cut in oval form. As the curvature of the shaped or cut metal changes, due to the oval form imparted to the same, it is important to present the cutters thereto at different angles relatively to the greater and less curves of the same, as is practiced in cutting with hand shears, it being noticed that while said angles may increase or decrease they are nevertheless tangential to the metal hence theyoke to which the cutters are directly attached, and which is pivoted to the carriage, receives motion from the cam M in such manner that the cuttingedges of the cutter assume angles more or less obtuseor acute as they act upon the metal while cutting the greater or less curves,so that 5 the cut is made smooth and without buckplates into oval form, the yoke H is set back fromthe heads the required extent, so as to adjust the position of the cutters relatively to the required dimensions of the shaped metal, it being seen that the oarriageEis longitudinally slotted to receive bolts which are passed through the slots into the base of the yoke and tightened by nuts, whereby the yoke and connected parts are securely held in adjusted position, the bar or arm K being also adj ustably connected to the yoke.

The former or shaping-piece F may be of other rounded forms than oval, as'is evident, without departing from my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A machine for cutting metal into oval form, having cutters which are attached to a 0 yoke or support, which has pivotal motions on asustaining-carriage, substantially as and for the purpose set forth.

2. A carriage supporting a pivotalyokeand cutters connected with said yoke, in'oombina- '3 5 tion with a shaft carrying a holder for the metal,

a former or shaper controlling the action of the cutters, and a cam imparting motions to the pivotal yoke, substantially as and for the purpose set forth. 40'

E. A. COLES.

WVitnesses:

JOHN A. WIEDERsrrEIM, A. P. GRANT. 

